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2015 Porsche Cayenne - Feels bumpy

A 2015 Porsche Cayenne S with 60 K miles and 8 speed auto tranny. Recently I have noticed that when accelerating from a light there will be 2 or 3 “bumps” that, even though the road surface is smooth, feels like I have just run over some uneven pavement. This happens only at low speeds and is not noticeable above gears 1, 2, and 3.
Problems with the drive train?

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